Question

What are the tird-party frameworks that are more useful to create a generic application? I am looking for a framework that is well documented, and that would allow me to not write from zero a set of classes that every applications should have.
There are some frameworks made available free from some software houses, but the documentation is not enough to help to use the framework.

Answer 1

Assuming you’ve perused the system’s integrated frameworks/capabilities, and not knowing what you need beyond them, I recommend:

http://www.omnigroup.com/developer/

EDIT:
In response to the clarification:

For string colorization and syntax highlighting, there are classes like CFAttributedString and NSAttributedString. That will require you to parse the sources, but is the basis for simple text drawing. You may also want to see CoreText.framework (ships with OS X). For something that would likely require the least work, Scintilla was (last I checked) in the process of supporting OS X. Though I do not know of a framework that meets all your marks in that regard.

Regarding AppleScript: Apple does provide these some applescript objects (syntax colorization by - [NSApplescript richTextSource]). Apple has not provided this support for other languages, and it is a very long, complicated process, depending on the languages you’d like to support. If there are many, I would choose Scintilla.